To add to my post above...
http://www.halls.md/body-mass-index/bmi.htm
You can input your age and gender there. I put her height/weight, and her age, and this was the answer:
BMI: 18.2
Body Description: In Normal Range
Conclusion: Either Wii Fit has a bug, or there's something wrong in this story.
My Mario Kart Wii friend code: 2707-1866-0957







